Principal Plane (Of Shear Fracture)
Principal Plane (Of Shear Fracture) :
The most favorably oriented plane for shear fracture. Given planes of equal shear strength and of all possible orientations, the principal plane is that which minimizes the work done in shear. The orientation is given by tan 2β=1/µ∗, where β is the angle between the greatest principal stress and the normal to the plane of interest, and µ∗ is the coefficient of friction for a fault or the coefficient of internal friction for an intact rock. See Lockner and Beeler (2002, p. 508)
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